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*åç: Wikimedia Commons*Broken Hill ã®æãèåãªæšæ¬ã¯ãªãŒã¹ãã©ãªã¢ã®å ¬å ±ã³ã¬ã¯ã·ã§ã³ã«æèµãããŠããããªãŒã¹ãã©ãªã¢èªç¶å²åç©é€šãèªã Block 14 詊æãå«ã¿ãŸãã1930幎以åã«æ¡éããã1933幎ã«ç»é²ãããé·ã33Ãå¹ 27Ãé«ã12 cm ã®ã°ã«ãŒãã§ãããã®æé·çµæ¶ã¯28.7 cm ã«éããäžçã®æè¯ã®æ¹è§£ç³ïŒcerussiteïŒç£å°ãå·¡ã£ãŠåéå®¶ãè°è«ããéãBroken Hill ããªã話é¡ã«æããçç±ã説æããŠããŸããããŒã ãïŒTsumebïŒã¯çŸä»£ã®ã¬ã©ã¹ç¶ã§å®ç³ã®ãããªæ¹è§£ç³ã®å°è±¡ãæ¯é ããŠãããããããŸããããBroken Hill ã¯ãã®å»ºç¯çŸã«ãã£ãŠå°äœãä¿ã£ãŠããŸããå£ç¶ã®çµæ¶ãæ Œåç¶ã®æ§é ãç®±ç¶çµæ¶ããããŠå€ãé žå垯ã®çµã¿åããã¯ããŸãã«ãã®äžŠå€ããé±èããããçãŸãåŸãŸããã## ç¹éæšæ¬
Search for specimens: View all cerussite specimens from Broken Hill, Australia
Broken Hill lies in far western New South Wales and is one of the foundational names in Australian mining. The orebody was discovered in 1883 when boundary rider Charles Rasp recognized mineralization on the outcrop, initially thinking in terms of tin before the silver-lead richness of the lode became clear. The Broken Hill Proprietary Company was formed in 1885, and the district became the birthplace of BHP, later one of the worldâs major resource companies.
Geologically, cerussite is a secondary mineral here, concentrated in the oxidized zone above and within the weathered portions of the lead-zinc-silver lode. The original Broken Hill orebody consisted chiefly of galena, sphalerite, and silver-bearing minerals, later modified by metamorphism, deformation, and long exposure to surface waters. Where lead-bearing sulfides were oxidized, cerussite developed in cracks, vugs, and gossan cavities, especially in association with anglesite, pyromorphite, coronadite, goethite, quartz, and other secondary species. The dark gossan at Broken Hill was not a simple iron cap; published work describes much of it as a dense black rock rich in plumbic coronadite, with cerussite and pyromorphite becoming more evident downward in cracks and scattered masses.
Historically important cerussite specimens came from multiple parts of the Line of Lode, including the Broken Hill Proprietary Mine, Block 14, the British Mine, the Central Mine, South Mine workings, and later the Kintore and Block 14 open cuts. Early descriptions single out the British Mine for long prismatic âswordâ crystals and the Central Mine for enormous masses of reticulated white cerussite. The BHP Block 14 Mine is especially important to collectors because of the great museum specimens collected before its closure and the major suite donated to the Australian Museum in 1933.
Collecting access today should be treated as essentially closed unless formal permission has been obtained. Broken Hill is not an open public collecting ground; the old workings, dumps, leases, and operating or rehabilitated mine areas involve private tenure, mine safety obligations, and environmental controls. The best way to study the locality in person is through museum displays and heritage interpretation, especially the Albert Kersten Mining and Minerals Museum in Broken Hill and the Australian Museum collections in Sydney. Modern field collecting around active or historic mines without permission is not appropriate, and serious Broken Hill cerussite on the market overwhelmingly comes from old collections rather than contemporary casual collecting.ã³ã¬ã¯ã¿ãŒåè³ªã®æ£é·ç³ééïŒcerussiteïŒã®çç£ã¯ã19äžçŽåŸåãã20äžçŽåé ã®é žå垯ã®åææ¡ææã«æãçãã§ãããåŸå¹Žãé žåå°ç€ã®é²å€©æãã¯ç¹ã«ãã³ããŒã«åšèŸºãšãããã¯14ã§ãè§éç³ãå«ãæ¹è§£ç³ã®äºæ¬¡é±ç©ã远å çç£ããŸãããã象城çãªå€§ããªç¶²ç®ç¶ã»ééç¶æšæ¬ã¯äž»ã«æ§æä»£ã®äœåã§ãããã®å¹Žéœ¢ã¯åœŒãã®ã¢ã€ãã³ãã£ãã£ã®äžéšã§ãããããŒã¯ã³ã»ãã«ç£ã®æ£é·ç³ééã«ã¯ãåæã®ãªãŒã¹ãã©ãªã¢åéå²ãå»ãŸããŠãããPbCO3ã®æšæ¬ã«ãšã©ãŸããããªãŒã¹ãã©ãªã¢ã®é±ç©åé圢ææã®çåè ãšããŠã®äŸ¡å€ããããŸãã## Broken Hill, Australiaç£ã»ã¬ãµãµã€ãã®ç¹æ§
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Broken Hill cerussite is an authenticity-driven locality. The species itself is not hard to identify when tested sensibly: cerussite is very dense, relatively soft, adamantine to vitreous, and usually white to colorless in Broken Hill material. The challenge is not usually whether the mineral is cerussite, but whether the specimen is correctly localized, honestly described, and structurally original.
Documented specimen-scale fraud specific to Broken Hill cerussite is not a major published theme, but repairs are a real concern. The very forms collectors prizeâopen reticulated lattices, long bladed crystals, and arrowhead twinsâare mechanically vulnerable. Old-time specimens may have been broken during mining, transport, cleaning, photography, or later handling. Use magnification to inspect crystal junctions, the bases of blades, and points where reticulated networks meet matrix. Look for glossy glue in recesses, mismatched luster across a break, repeated oddly perfect junctions, or faces that do not line up crystallographically. Longwave UV can sometimes reveal modern adhesives, though absence of fluorescence does not prove absence of repair.
Condition standards should be realistic. Many genuine Broken Hill cerussites have small chips, bruised edges, missing terminations, iron-oxide staining, or natural coatings of anglesite that mute the luster. Old labels may use broad locality names such as âBroken Hill,â âB.H.P. Mine,â âSouth Mine,â or âBlock 14,â and these are often more credible than modern overly precise attributions without provenance. A vague but old Australian label can be preferable to a recent label assigning an exact sublocality with no supporting history.
Treatments to watch for include stabilization of fragile reticulated groups, reattachment of broken blades, trimming of matrix to improve display, and overly aggressive cleaning. Acid cleaning can brighten cerussite but may also alter gossan matrix or remove desirable patina. Shellacked or darkened matrix is less often discussed for this locality than for some others, but any unnatural gloss on iron-oxide matrix deserves scrutiny. Cerussite is a lead mineral, so normal mineral-specimen hygiene applies: do not lick, soak, abrade, or prepare specimens in a way that creates dust; wash hands after handling; and keep fragile lead-carbonate specimens away from children.
Rarity is strongly tied to form and condition. Small Broken Hill cerussites and cerussite-bearing combination specimens remain available, especially from dispersed old collections. Large undamaged reticulated groups, good sword-crystal specimens, and pieces with early collection history are scarce. The finest examples have migrated into museums or long-held private collections, and when a significant old specimen appears, its value is driven as much by locality status and survival as by mineral aesthetics.## Stories & Field Notes
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Australian Museum â âCerussiteâ â äŒèª¬çãªBHP Block 14ã®ã»ãªãµã©ã€ãã®åç©é€šèšé²ããµã€ãºãå鿥ãç»é²è©³çްãåŸã«BancroftãAustralia Postã®æèã§ã®ç»å Žãå«ãã
Mindat â Cerussite from Broken Hill, Broken Hill district, New South Wales â Broken Hillããã³åšèŸºã®äžççæšæºåãšããŠã®ã»ãªãµã©ã€ãã瀺ãåºæ¬ locality èšè¿°ãšãé¢é£é±ç©ããã³äžäœ locality ã®èšé²ã
Mindat â âBest of⊠Cerussiteâ â Broken Hillã®ã»ãªãµã©ã€ãç¿æ§ã®ã³ã¬ã¯ã¿ãŒåãèŠçŽãç¶²ç¶çŸ€ãç¢é ãã€ã³ãå£ç¶çµæ¶ãMarshãšSmithã®åç §ãå«ãŸããã
Marsh, C.W. (1897), Mineralogical notes. No. V. Cassiterite, cerussite, zeolites and other Australian minerals. Australian Museum PDF â æ©æã®ãªãŒã¹ãã©ãªã¢é±ç©åŠçèå¯ãBroken Hillã®ã»ãªãµã©ã€ããå«ãã
Smith, George (1926), A Contribution to the Mineralogy of New South Wales, Mineral Resources No. 34, New South Wales Department of Mines â Broken Hillã®ã»ãªãµã©ã€ãããã³ãã®ä»ã®ãã¥ãŒãµãŠã¹ãŠã§ãŒã«ãºå·é±ç©ã®èšè¿°ã§ç¹°ãè¿ãåŒçšãããå€å žçè³æã
Worner, H.K. and Mitchell, R.W., eds. (1982), Minerals of Broken Hill. Australian Mining & Smelting Ltd. Bibliographic listing â å€§èŠæš¡ãª locality ã¢ãã°ã©ããæ°çŸçš®ã®Broken Hillé±ç©ãèšè¿°ããéèŠæšæ¬ãå³ç€ºã
Powerhouse Collection â âSpecimen of cerussite from Broken Hill, New South Walesâ â Aldridge-Dixsonã³ã¬ã¯ã·ã§ã³ã®åäžç¹ã®ã»ãªãµã©ã€ãæšæ¬ã®èšé²ãåºå žãšåéå±¥æŽãå«ãã
Mindat minID FDL-MKH â Broken Hill Proprietary Mine cerussite â Aldridgeã³ã¬ã¯ã·ã§ã³èæ¯ãšåŸã®ã·ãããŒå€§åŠå²ãå«ãã17 x 15.5 x 8 cmã®ç¶²ç¶ã»ãªãµã©ã€ããèšé²ã
Peter Andersen â âThe worldâs best Broken Hill, N.S.W., cerussiteâ â DavyãFranksãChapmanãSomervilleã³ã¬ã¯ã·ã§ã³ãçµãèåãªBlock 14ã»ãªãµã©ã€ãã®åºèªç©èªã
Peter Andersen â âA Compilation of some Broken Hill mineral collectionsâ â äž»èŠãªBroken Hillé±ç©ã³ã¬ã¯ã·ã§ã³ãšæ§æšæ¬ã®ç§»åã远螪ããæçãªã³ã¬ã¯ã¿ãŒå²èšäºã## ãããªãèªã¿ç©ãšå€éšãªã³ã¯
ãªãŒã¹ãã©ãªã¢åç©é€š â ç¡«ç ééé± cerussite â æå㪠Block 14 ã®ç¡«ç ééé±ãšãã®åç©é€šã®æŽå²ã«ã€ããŠã®æè¯ã®å ¬éããŒãžã
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Mindat â Best of Cerussite â Broken Hill ã® cerussite ãä»ã®äžçç£å°ãšæ¯èŒããã®ã«æçšãªåéå®¶åãã¬ã€ãã
Wikimedia Commons â Minerals of Broken Hill â Broken Hill ã® cerussiteãanglesite-cerussiteããã®ä»å€ãã®é¢é£çš®ãå«ãå ¬éç»åã¢ãŒã«ã€ãã
ScienceDirect â âThe gossan at Broken Hillâ â ç°äŸã® Broken Hill ã®ãŽããµã³ãšé žå垯ã«ããã cerussite and pyromorphite ã®äœçœ®ã¥ãã«é¢ããæè¡èŠçŽã
Geoscience Australia â Broken Hill Exploration Initiative Project â Broken Hill- Olary å°åã®å°è³ªåŠçæèãšåºåã® Curnamona Province äœæ¥ã
Broken Hill City Council â History â 1883 幎ã®çºèŠãæ¡æéçºãããã³ BHP ã®èµ·æºã®ç°¡æœãªåžæ°å²ã
BHP â Our History â Broken Hill ã®é-éçºèŠãš BHP ã®åœ¢æããå§ãŸãäŒæ¥å²ã®å¹Žè¡šã
Albert Kersten Mining and Minerals Museum â Broken Hill ã®å°è³ªåŠã»é±ç©åŠã»æ¡é±éºç£ã®å°å åç©é€šè³æºã
Powerhouse Collection â Aldridge cerussite specimens â Aldridge-Dixson åºå žã®ç©èªãèšé²ããåç©é€šèšé²ã